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Total magnetic field versus distance along the z axis for two vertically orientated 5 nm diameter spheres separated by h = 0.1 nm, 1 nm, 5 nm, and 15 nm. The inset shows a schematic representation of the Tx loop and spheres in a coordinate system. The y axis is in plane. The Tx loop is placed at x = y = 0, z = 3 cm.
